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		<h1>Python 字典（Dictionary）</h1>
	
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		<span class="article__date">2017-10-12</span><br />
		
		
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			  	<a class="article__tag-link" href="/tags/Python/">Python</a>
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		<h1 id="Python-字典"><a href="#Python-字典" class="headerlink" title="Python 字典"></a>Python 字典</h1><p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;字典是另一种可变容器模型，切可存储任意类型对象。</p>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;字典是 Python 中唯一的映射类型（哈希表）</p>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;字段对象是可变的，但是字典的键必须使用 <code>可变对象</code> ，一个字典中可以使用不同类型的键值。</p>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;字典的每个键值（key=&gt;value）对用冒号(:)分割，每个对之间用逗号(,)分割，整个字典包括在花括号({})中，格式如下所示：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">d = &#123;key1 ： value1,key2 : value2 &#125;</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;键必须是唯一的，但值则不必。</p>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;值可以去任何数据类型，但键必须是不可变的，如字符串，数字或元组。</p>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;一个简单的字典实例：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">dict = &#123;<span class="string">'Alice'</span>:<span class="string">'2341'</span>, <span class="string">'Beth'</span>: <span class="string">'9102'</span>, <span class="string">'Cecil'</span>: <span class="string">'3258'</span>&#125;</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;也可如此创建字典：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">dict1 = &#123; <span class="string">'abc'</span>: <span class="number">456</span>&#125;;</div><div class="line">dict2 = &#123; <span class="string">'abc'</span>: <span class="number">123</span>, <span class="number">98.6</span><span class="string">" 37 &#125;;</span></div></pre></td></tr></table></figure>
<h2 id="访问字典里的值"><a href="#访问字典里的值" class="headerlink" title="访问字典里的值"></a>访问字典里的值</h2><p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;把相应的键放入熟悉的方括号</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line"><span class="comment">#/usr/bin/python</span></div><div class="line"></div><div class="line">dict = &#123;<span class="string">'Name'</span>: <span class="string">'Zara'</span>, <span class="string">'Age'</span>: <span class="number">7</span>, <span class="string">'Class'</span>: <span class="string">'First'</span>&#125;;</div><div class="line"></div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Name']: "</span>, dict[<span class="string">'Name'</span>];</div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Age']: "</span>, dict[<span class="string">'Age'</span>];</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;输出结果为：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">dict[<span class="string">'Name'</span>]:  Zara</div><div class="line">dict[<span class="string">'Age'</span>]:  <span class="number">7</span></div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;如果用字典里没有的键访问数据，会输出如下错误：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="comment">#!/usr/bin/python</span></div><div class="line"> </div><div class="line">dict = &#123;<span class="string">'Name'</span>: <span class="string">'Zara'</span>, <span class="string">'Age'</span>: <span class="number">7</span>, <span class="string">'Class'</span>: <span class="string">'First'</span>&#125;;</div><div class="line"> </div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Alice']: "</span>, dict[<span class="string">'Alice'</span>];</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;实例输出结果：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">dict[<span class="string">'Alice'</span>]: </div><div class="line">Traceback (most recent call last):</div><div class="line">  File <span class="string">"test.py"</span>, line <span class="number">5</span>, <span class="keyword">in</span> &lt;module&gt;</div><div class="line">    <span class="keyword">print</span> <span class="string">"dict['Alice']: "</span>, dict[<span class="string">'Alice'</span>];</div><div class="line">KeyError: <span class="string">'Alice'</span></div></pre></td></tr></table></figure>
<h2 id="修改字典"><a href="#修改字典" class="headerlink" title="修改字典"></a>修改字典</h2><p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;向字典添加新内容的方法是增加新个键/值对，修改或删除已有键/值对：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line"><span class="comment">#!/usr/bin/python</span></div><div class="line"> </div><div class="line">dict = &#123;<span class="string">'Name'</span>: <span class="string">'Zara'</span>, <span class="string">'Age'</span>: <span class="number">7</span>, <span class="string">'Class'</span>: <span class="string">'First'</span>&#125;;</div><div class="line"> </div><div class="line">dict[<span class="string">'Age'</span>] = <span class="number">8</span>; <span class="comment"># update existing entry</span></div><div class="line">dict[<span class="string">'School'</span>] = <span class="string">"DPS School"</span>; <span class="comment"># Add new entry</span></div><div class="line"> </div><div class="line"> </div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Age']: "</span>, dict[<span class="string">'Age'</span>];</div><div class="line"><span class="keyword">print</span> <span class="string">"dict['School']: "</span>, dict[<span class="string">'School'</span>];</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;输出结果：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">dict[<span class="string">'Age'</span>]:  <span class="number">8</span></div><div class="line">dict[<span class="string">'School'</span>]:  DPS School</div></pre></td></tr></table></figure>
<h2 id="删除字典元素"><a href="#删除字典元素" class="headerlink" title="删除字典元素"></a>删除字典元素</h2><p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;能删除单一的元素也能清空字典，清空只需一向操作。<br>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;显示删除一个字典用 del 命令：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="comment">#!/usr/bin/python</span></div><div class="line"><span class="comment"># -*- coding: UTF-8 -*-</span></div><div class="line"> </div><div class="line">dict = &#123;<span class="string">'Name'</span>: <span class="string">'Zara'</span>, <span class="string">'Age'</span>: <span class="number">7</span>, <span class="string">'Class'</span>: <span class="string">'First'</span>&#125;;</div><div class="line"> </div><div class="line"><span class="keyword">del</span> dict[<span class="string">'Name'</span>]; <span class="comment"># 删除键是'Name'的条目</span></div><div class="line">dict.clear();     <span class="comment"># 清空词典所有条目</span></div><div class="line"><span class="keyword">del</span> dict ;        <span class="comment"># 删除词典</span></div><div class="line"> </div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Age']: "</span>, dict[<span class="string">'Age'</span>];</div><div class="line"><span class="keyword">print</span> <span class="string">"dict['School']: "</span>, dict[<span class="string">'School'</span>];</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;但这会引发一个异常，因为用 del 后字典不再存在：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">dict[<span class="string">'Age'</span>]:</div><div class="line">Traceback (most recent call last):</div><div class="line">  File <span class="string">"test.py"</span>, line <span class="number">8</span>, <span class="keyword">in</span> &lt;module&gt;</div><div class="line">    <span class="keyword">print</span> <span class="string">"dict['Age']: "</span>, dict[<span class="string">'Age'</span>];</div><div class="line">TypeError: <span class="string">'type'</span> object <span class="keyword">is</span> unsubscriptable</div></pre></td></tr></table></figure>
<h2 id="字典键的特性"><a href="#字典键的特性" class="headerlink" title="字典键的特性"></a>字典键的特性</h2><p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;字典值可以没有限制地取任何 Python 对象，既可以是标准的对象，也可以是用户定义的，但键不行。</p>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;两个重要的点需要记住</p>
<ol>
<li>不允许同一个键出现两次。创建时如果同一个键被赋值两次，后一个值会被记住：</li>
</ol>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="comment">#!/usr/bin/python</span></div><div class="line"></div><div class="line">dict = &#123;<span class="string">'Name'</span>:<span class="string">'zata'</span>, <span class="string">'Age'</span>: <span class="number">7</span>, <span class="string">'Name'</span>: <span class="string">'Manni'</span>&#125;;</div><div class="line"></div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Name']: "</span>, dict[<span class="string">'Name'</span>];</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;输出结果</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">dict[<span class="string">'Name'</span>]: Manni</div></pre></td></tr></table></figure>
<ol>
<li>键必须不可变，所以可以用数字，字符串或元组充当，所以用列表就不行：</li>
</ol>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="comment">#!/usr/bin/python</span></div><div class="line"> </div><div class="line">dict = &#123;[<span class="string">'Name'</span>]: <span class="string">'Zara'</span>, <span class="string">'Age'</span>: <span class="number">7</span>&#125;;</div><div class="line"> </div><div class="line"><span class="keyword">print</span> <span class="string">"dict['Name']: "</span>, dict[<span class="string">'Name'</span>];</div></pre></td></tr></table></figure>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;输出结果：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">Traceback (most recent call last):</div><div class="line">  File <span class="string">"test.py"</span>, line <span class="number">3</span>, <span class="keyword">in</span> &lt;module&gt;</div><div class="line">    dict = &#123;[<span class="string">'Name'</span>]: <span class="string">'Zara'</span>, <span class="string">'Age'</span>: <span class="number">7</span>&#125;;</div><div class="line">TypeError: list objects are unhashable</div></pre></td></tr></table></figure>
<h2 id="字典内置函数-amp-方法"><a href="#字典内置函数-amp-方法" class="headerlink" title="字典内置函数&amp;方法"></a>字典内置函数&amp;方法</h2><p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Python 字典包含了以下内置函数：</p>
<table>
<thead>
<tr>
<th>序号</th>
<th>函数及描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E5%87%BD%E6%95%B0/1.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20cmp(" target="_blank" rel="external">cmp(dict1, dict2)</a>%E6%96%B9%E6%B3%95.md)，较两个字典元素</td>
</tr>
<tr>
<td>2</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E5%87%BD%E6%95%B0/2.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20len(" target="_blank" rel="external">len(dict)</a>%E6%96%B9%E6%B3%95.md)，计算字典元素个数，既键的总和。</td>
</tr>
<tr>
<td>3</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E5%87%BD%E6%95%B0/3.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20str(" target="_blank" rel="external">str(dict)</a>%E6%96%B9%E6%B3%95.md)，输出字典可打印的字符串表示。</td>
</tr>
<tr>
<td>4</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E5%87%BD%E6%95%B0/4.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20type(" target="_blank" rel="external">type(variable)</a>%E6%96%B9%E6%B3%95.md)，返回输入的变量类型，如果变量是字典就返回字典类型。</td>
</tr>
</tbody>
</table>
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Python 字典包含了以下内置方法：</p>
<table>
<thead>
<tr>
<th>序号</th>
<th>函数及描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/1.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20clear(" target="_blank" rel="external">dict.clear()</a>%E6%96%B9%E6%B3%95.md)，删除字典内所有元素</td>
</tr>
<tr>
<td>2</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/2.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20copy(" target="_blank" rel="external">dict.copy()</a>%20%E6%96%B9%E6%B3%95.md)，返回一个字典的浅复制</td>
</tr>
<tr>
<td>3</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/3.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20fromkeys(" target="_blank" rel="external">dict.fromkeys(seq[, val]))</a>%E6%96%B9%E6%B3%95.md)，创建一个新字典，以序列 seq 中元素做字典的键，val 为字典所有键对应的初始值</td>
</tr>
<tr>
<td>4</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/4.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20get(" target="_blank" rel="external">dict.get(key, default=None)</a>%E6%96%B9%E6%B3%95.md)，返回指定键的值，如果值不在字典中返回default值</td>
</tr>
<tr>
<td>5</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/5.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20has_key(" target="_blank" rel="external">dict.has_key(key)</a>%E6%96%B9%E6%B3%95.md)，如果键在字典dict里返回true，否则返回false</td>
</tr>
<tr>
<td>6</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/6.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20items(" target="_blank" rel="external">dict.items()</a>%E6%96%B9%E6%B3%95.md)，以列表返回可遍历的(键, 值) 元组数组</td>
</tr>
<tr>
<td>7</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/7.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20keys(" target="_blank" rel="external">dict.keys()</a>%E6%96%B9%E6%B3%95.md)，以列表返回一个字典所有的键</td>
</tr>
<tr>
<td>8</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/8.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20setdefault(" target="_blank" rel="external">dict.setdefault(key, default=None)</a>%E6%96%B9%E6%B3%95.md)，和get()类似, 但如果键不存在于字典中，将会添加键并将值设为default</td>
</tr>
<tr>
<td>9</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/9.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20update(" target="_blank" rel="external">dict.update(dict2)</a>%E6%96%B9%E6%B3%95.md)，把字典dict2的键/值对更新到dict里</td>
</tr>
<tr>
<td>10</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/10.%20Python%20%E5%AD%97%E5%85%B8%EF%BC%88Dictionary%EF%BC%89%20values(" target="_blank" rel="external">dict.values()</a>%E6%96%B9%E6%B3%95.md)，以列表返回字典中的所有值</td>
</tr>
<tr>
<td>11</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/11.%20Python%20%E5%AD%97%E5%85%B8%20pop(" target="_blank" rel="external">pop(key[,default])</a>%E6%96%B9%E6%B3%95.md)，删除字典给定键 key 所对应的值，返回值为被删除的值。key值必须给出。 否则，返回default值。</td>
</tr>
<tr>
<td>12</td>
<td><a href="https://github.com/hcldirgit/studygit/blob/master/Python%E5%AD%97%E5%85%B8%E5%86%85%E7%BD%AE%E6%96%B9%E6%B3%95/12.%20Python%20%E5%AD%97%E5%85%B8%20popitem(" target="_blank" rel="external">popitem()</a>%E6%96%B9%E6%B3%95.md)，随机返回并删除字典中的一对键和值。</td>
</tr>
</tbody>
</table>

	

	
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